GL_ARB_compute_variable_group_size on Iris.
VK_AMD_texture_gather_bias_lod on RADV.
VK_EXT_private_data on ANV and RADV.
VK_EXT_custom_border_color on RADV.
VK_EXT_pipeline_creation_cache_control on RADV.
VK_EXT_subgroup_size_control on RADV/ACO.
VK_GOOGLE_user_type on ANV and RADV.